You mean the serial connection between the Mote and your data processing application?
Saludos --- Martín René Vilugrón San Carlos de Bariloche Patagonia Argentina On Wed, May 15, 2013 at 9:24 PM, Mustafa <[email protected]>wrote: > Guys by the way, > I have couple question related to serial port communication which is due > today, how do we handle the difference between real time side thread and > user process side data rate > > Sent from my iPhone > > On May 15, 2013, at 8:19 AM, Martín René <[email protected]> wrote: > > Thanks in advance > > ---------- Forwarded message ---------- > From: Rodrigo Carbajales <[email protected]> > Date: Thu, May 9, 2013 at 2:33 PM > Subject: Re: [Tinyos-help] Z1 High speed i2c accelerometer sampling > To: [email protected] > Cc: Martín René Vilugrón <[email protected]> > > > Hi Antonio, My name is Rodrigo and I work with Martin Rene Vilugron at > CNEA, Argentina. > Thanks for the solution proposed. Now we can reach a sample frequency of > 1KHz! > I want to make another question, is it possible to use a faster timer? I > use TimerMilli but it is not possible to use Timer32khz or TimerMicro? > Regards, > Rodrigo > > > On 17 April 2013 10:06, Martín René <[email protected]> wrote: > >> Aceleración >> --- >> Martín René Vilugrón >> San Carlos de Bariloche >> Patagonia Argentina >> >> >> ---------- Forwarded message ---------- >> From: Antonio Linan <[email protected]> >> Date: Wed, Apr 17, 2013 at 5:53 AM >> Subject: Re: [Tinyos-help] Z1 High speed i2c accelerometer sampling >> To: Martín René <[email protected]> >> Cc: TinyOS Mailing Lists <[email protected]> >> >> >> Hello again, >> >> Using the TestADXL345 example in /apps/tests/z1/Accelerometer I got some >> numbers for you, basically you can: >> >> - Comment out the delay at /tos/chips/adxl345/adxl345P file in line 787. >> - Edit the example and start the Accelerometer only once (in boot only), >> then periodically sample 1 axis >> >> As it is the ubr (in /tos/platforms/z1/chips/msp430/usci/Z1UsciP.nc is >> set to 800, as SMCLK is sourced from the DCO with /1 divider, this gives a >> rough 10KHz clock (I measured this to be actually 9.8724Khz), giving you a >> total reading time of 4.84ms (measured just before calling .read() and in >> readDone() event). Changing the ubr to 80 you can get a 87.912Khz clock >> (measured), with a reading time of 0.711ms. >> >> Hope this helps. >> >> Regards, >> >> --Antonio >> >> >> On Tue, Apr 16, 2013 at 10:29 PM, Antonio Linan <[email protected]>wrote: >> >>> Hola! >>> >>> Yes, there might be room for improvement, if you look at the code it has >>> an active waits (around line 787) that slow the readings but were >>> necessary at the time, also one could try and configure the I2C module with >>> different settings (UBR for example) to see if more speed is allowed. I >>> have planned a revision of the usci driver, so things may change, in the >>> meantime if you wanna dig a little you are welcome, che :) >>> >>> Saludos! >>> >>> --Antonio >>> >>> >>> >>> >>> >>> >>> On Tue, Apr 16, 2013 at 7:16 PM, Martín René <[email protected]>wrote: >>> >>>> Sorry that i didn't make the interface problem clear... >>>> >>>> The accelerometer is digital using i2c interface, and doesn't provide a >>>> readstream interface. >>>> >>>> With another sensor, we reached high sampling speeds using the >>>> processor's ADC, but the bus does'nt seem to reach the necessary speeds, >>>> maybe delays or something else slows down the sampling... >>>> >>>> >>>> Saludos y muchas gracias! >>>> >>>> --- >>>> Martín René Vilugrón >>>> San Carlos de Bariloche >>>> Patagonia Argentina >>>> >>>> >>>> On Tue, Apr 16, 2013 at 1:58 PM, Michael Schippling >>>> <[email protected]>wrote: >>>> >>>>> There are some intriguingly named files containing "Stream" and "DMA" >>>>> in the ...tinyos-2.x_main/tos/chips/**msp430/adc12 directory. Some of >>>>> them even have comments which reference TEP documents that might >>>>> explain what they are trying to do. Maybe one of them will allow >>>>> you to run the ADC at higher rates... >>>>> >>>>> In T1 with the mica's (what I know....) one could free-run a single >>>>> ADC at low audio rates by bypassing most of TOS. >>>>> >>>>> MS >>>>> >>>>> >>>>> >>>>> On 4/15/2013 1:27 PM, Martín René wrote: >>>>> >>>>>> We are currently using the Z1 Motes and sampling at 200Hz without >>>>>> problems, but we can't raise the sampling speed above said speed >>>>>> without >>>>>> starting to have problems. We need to sample at 1000Hz and we can't >>>>>> get >>>>>> there. >>>>>> >>>>>> I know that the resources of the platform are scarse, but i know that >>>>>> the ADC can manage those speeds, and as we don't have a analog >>>>>> accelerometer we neee to speed up all we can the ADXL. >>>>>> >>>>>> Is it possible to sample the accelometer at those speeds? >>>>>> If it is, ¿how? >>>>>> >>>>>> Thanks! and saludos >>>>>> >>>>>> --- >>>>>> Martín René Vilugrón >>>>>> San Carlos de Bariloche >>>>>> Patagonia Argentina >>>>>> >>>>>> >>>>>> ______________________________**_________________ >>>>>> Tinyos-help mailing list >>>>>> Tinyos-help@millennium.**berkeley.edu<[email protected]> >>>>>> https://www.millennium.**berkeley.edu/cgi-bin/mailman/** >>>>>> listinfo/tinyos-help<https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help> >>>>>> >>>>>> >>>> >>>> _______________________________________________ >>>> Tinyos-help mailing list >>>> [email protected] >>>> https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help >>>> >>> >>> >>> >>> -- >>> -- >>> Antonio Liñan Colina >>> R+D+I Engineer >>> @: [email protected] >>> @: [email protected] >>> ------------------------------ >>> Advancare >>> T: +34 93 582 02 70 >>> http://www.advancare.com >>> http://www.zolertia.com >>> http://zolertia.sourceforge.net >>> http://webshop.zolertia.com >>> >> >> >> >> -- >> -- >> Antonio Liñan Colina >> R+D+I Engineer >> @: [email protected] >> @: [email protected] >> ------------------------------ >> Advancare >> T: +34 93 582 02 70 >> http://www.advancare.com >> http://www.zolertia.com >> http://zolertia.sourceforge.net >> http://webshop.zolertia.com >> >> > > _______________________________________________ > Tinyos-help mailing list > [email protected] > https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help > >
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